Drop Down MenusCSS Drop Down MenuPure CSS Dropdown Menu

Oracle to Postgresql migration

-
Oracle migration:
For migration first we need to install oracle database and ora2pg software and DBD oracle packages.
=>first install oracle database in server and note down the paths,username,password needed

For installing the oracle database follow the below steps:
From the root user:
create group "groupadd oinstall"
create group "dba"
create user "useradd oracle -G dba -g oinstall
create directory "mkdir /home/oracle/software"
Change ownership permissions to software directory
chown oracle:oinstall /home/oracle/software

copy the downloaded files to /home/oracle/software and untar the files
After untaring we can find "database" directory in /home/oracle/software

In database directory we find runinstaller file we need to run that file
./runinstaller

and finish the oracle database installation.
=======================================================================

After finishing the installation switch to oracle user
export the paths in .bash_profile of the oracle user:
PATH=/home/oracle/app/oracle/product/11.2.0/dbhome_2/bin:$PATH:$HOME/.local/bin:$HOME/bin
export ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_2
export ORACLE_SID=orcl
save and exit

execute the .bash_profile
To find the oracle_sid  ps -ef | grep pmon

we will get the running processes in that:
oracle  12929   1 0  18:89  ? 00:00:00 ora_pmon_orc1

in the above proces oracle_sid is orac1, sid means "system identifier"

For logining into oracle database we have three ways:
1.sqlplus / as sysdba
2.sqlplus system/oracle
3.lsnrctl status

=======================================================================
Create user in oracle server: 
create user migration identified by migration;

give grant priviliges on migration: 
grant dba to migration;

logout of the server: 
quit

login with migration user: 
sqlplus migration/migration

--create table: 
create table test(id int,name varchar2(200),sex char(1),text1 clob);
insesrt into table: insert into test values(1,'raags','M','dzlbvrzvbvbk');

--after inserting we need do commit: commit;
 ==================================================================
For installing ora2pg package go to this link and download: 
https://github.com/darold/ora2pg/releases
after downloading go to root user and move the ora2pg package to /home/postgres  and give the postgres ownership to the ora2pg package.
untar the package and go to the ora2pg-18.2 directory and run the below commands to innstall the package
perl Makefile.sh
make
make install
========================================================================
ora2pg need perl module DBD::ORACLE for connectivity to an oracle database from perl DBI::Oracle get it from CPAN a perl repository, After setting oracle_home and ld_library_path environment variables as root user.Install DBD::Oracle.Proceed as follows
export ORACLE_HOME=/home/oracle/app/oracle/product/11.2.0/dbhome_2
export LD_LIBRARY_PATH=/home/oracle/app/oracle/product/11.2.0/dbhome_2/lib

perl -MCPAN -e 'install DBD::ORACLE'(IF WE HAVE INTERNET TO THE SERVER WE CAN COMPLETE THE INSTALLATION OTHERWISE WE NEED TO DO MANUALLY).
export PATH=/home/postgres/software/bin:$PATH(IN ROOT USER WE NEED TO EXPORT THE PATH).
ora2pg --version
cd /etc/ora2pg
ls -ltr
cp ora2pg.conf.dist ora2pg.conf
In the above conf file we need to do configuration copy the below lines at the end of the conf file:
ORACLE_DSN      dbi:Oracle:host=localhost;sid=orcl
ORACLE_USER     migration
ORACLE_PWD      migration
SCHEMA          migration
TYPE       TABLE  PACKAGE COPY VIEW GRANT SEQUENCE TRIGGER FUNCTION PROCEDURE TABLESPACE TYPE PARTITION
OUTPUT          rc_output.sql

and we  need to change the oracle_home in the above conf file:
ORACLE_HOME   /home/oracle/app/oracle/product/11.2.0/dbhome_2
 save and exit from the conf file
and run ora2pg after running the above command we will get a plain text named in the conf file like (rc_output.sql)
cd /etc/ora2pg in this location we can find the (rc_output.sql).
Give the executive permissions to the file (chmod 777 rc_output.sql).
========================================================================
Now login to the postgres server and execute the rc_output.sql file
\i rc_output.sql
After executing the file the database is successfully migrated from the oracle to postgres.


Written BY :- Raghavan Rao

Comments

Post a Comment

Popular posts from this blog

2017 Shortern URL - Other Website Like ADFOC.US

-
Image
These are the lists of top paying url shortening websites that are similar to Adfoc.us or Shrink url Websites like Adfoc.us. The websites are similar in the sense that you can use the same pattern of registration and earnings for all them, but the only difference is the amount of money each pays to its members and also the percentage of earnings from their referral programs. 1. ADF.LY – Free Url Shortening similar to adfocus that will pay you $4 for 1000 clicks on your shorten url. You can Also refer your friends and earn 20% of their earnings for life. Their payment is quick and consistant. Paypal Or Alertpay. It’s legit and very popular. JOIN  HERE It’s legit and very popular. JOIN  HERE Payment Options Details :- Payout for 1000 Views: Upto $9 Minimum Payout: $5 Referral Commission: 20% Payment Options:Payoneer, Payza Payment Time : Daily and On Request You can Withdraw money Following Acc
Read more

How to Repair Corrupt database postgresql

-
I love broken Postgres. Really. Well, not nearly as much as I love the usual working Postgres, but it's still a fantastic learning opportunity. A crash can expose a slice of the inner workings you wouldn't normally see in any typical case. And, assuming you have the resources to poke at it, that can provide some valuable insight without lots and lots of studying internals (still on my TODO list.) As a member of the PostgreSQL support team at End Point a number of diverse situations tend to cross my desk. So imagine my excitement when I get an email containing a bit of log output that would normally make a DBA tremble in fear: LOG: server process (PID 10023) was terminated by signal 11 LOG: terminating any other active server processes FATAL: the database system is in recovery mode LOG: all server processes terminated; reinitializing Oops, signal 11 is SIGSEGV, Segmentation Fault. Really not supposed to happen, especially in day to day activities. That'll caus
Read more

How to Get Table Size, Database Size, Indexes Size, schema Size, Tablespace Size, column Size in PostgreSQL Database

-
In this post, I am sharing few important function for finding the size of database, table and index in PostgreSQL. Finding object size in postgresql database is very important and common. Is it very useful to know the exact size occupied by the object at the tablespace. The object size in the following scripts is in GB. The scripts have been formatted to work very easily with PUTTY SQL Editor. 1. Checking table size excluding table dependency: SELECT pg_size_pretty(pg_relation_size('mhrordhu_shk.mut_kharedi_audit')); pg_size_pretty ---------------- 238 MB (1 row) 2. Checking table size including table dependency: SELECT pg_size_pretty(pg_total_relation_size('mhrordhu_shk.mut_kharedi_audit')); pg_size_pretty ---------------- 268 MB (1 row) 3. Finding individual postgresql database size SELECT pg_size_pretty(pg_database_size('db_name')); 4. Finding individual table size for postgresql database -including dependency index: SELECT pg_size_pretty(pg_total_rel
Read more

How To Schedule PostgreSQL Jobs using pgAgent on Linux plateform

-
Image
Taking regular SQL database backup is one of the most important responsibilities of a database administrator. By setting up automatic database backup we can get rid of the additional overhead of doing it manually, every day, week or month. When it comes to PostgreSQL running in any Unix distributions or in Windows, there are at least two ways to do it. Using the built in CronJobs/ CronTabs in case of  Linux, and Windows scheduled tasks in Windows . Using PostgreSQL’s own scheduling agent,  pgAgent . Often DBAs tends to rely on CronTabs or Scheduled tasked because of the ease of use it offers. But there are several advantages if you use pgAgent instead. Though it takes a little effort to install pgAgent, it is much better than Cron jobs or Scheduled tasks. Why use pgAgent over CronJob: Compared to CronTab, PgAgent has the following advantages:  You can have multiple steps for a job without having to resort to a batch script. You can have multiple schedules for a job
Read more

PostgreSQL pgBadger

-
pgBadger is a PostgreSQL log analyzer built for speed with fully reports from your PostgreSQL log file. It's a single and small Perl script that outperforms any other PostgreSQL log analyzer. It is written in pure Perl and uses a JavaScript library (flotr2) to draw graphs so that you don't need to install any additional Perl modules or other packages. Furthermore, this library gives us more features such as zooming. pgBadger also uses the Bootstrap JavaScript library and the FontAwesome webfont for better design. Everything is embedded. pgBadger is able to autodetect your log file format (syslog, stderr or csvlog). It is designed to parse huge log files as well as gzip compressed files. See a complete list of features below. Supported compressed format are gzip, bzip2 and xz. For the xz format you must have an xz version upper than 5.05 that supports the --robot option. All charts are zoomable and can be saved as PNG images. You can also limit pgBadger to only report err
Read more